Sam's Club currently has a Shocking Value deal: ProForm Performance 1800i Treadmill for $799.
It has a similar spec with the popular Pro 2000, except it has a 300 Lb max weight capacity (vs 350 Lb of Pro 2000).
3.5 CHP Mach Z™ Commercial Plus Motor
22" x 60" Tread Belt
0 – 12 MPH Digital QuickSpeed® Control
15% Digital Quick Incline™, -3% Digital Quick Decline™ Control
iFit® Coach Ready
7" Backlit Display
32 On-Board Workouts
EKG Grip Pulse Heart Rate Sensor with Included Wireless Chest Strap
2.5" Balanced Rollers
SpaceSaver® Design with EasyLift™ Assist
Treadmill folds up and out of the way when you're done
Dual CoolAire™ Workout Fans
300 Lb. Weight Capacity
Warranty: Protected with a Lifetime Frame & Motor Warranty, 5-Year Parts Warranty and 2-Year Labor Warranty